diff --git a/src/specify_cli/workflows/steps/command/__init__.py b/src/specify_cli/workflows/steps/command/__init__.py
index 8d7ea1503..8ab777089 100644
--- a/src/specify_cli/workflows/steps/command/__init__.py
+++ b/src/specify_cli/workflows/steps/command/__init__.py
@@ -189,7 +189,11 @@ class CommandStep(StepBase):
         not possible (integration not found, CLI not installed, or
         dispatch not supported).
         """
-        if not integration_key:
+        if not integration_key or not isinstance(integration_key, str):
+            # A non-string integration (a list/dict/expression that resolved to
+            # one) would raise TypeError: unhashable type from get_integration's
+            # dict lookup below and abort the whole run. Treat it as "not
+            # dispatchable" so execute() falls through to its FAILED StepResult.
             return None
 
         try:
diff --git a/src/specify_cli/workflows/steps/prompt/__init__.py b/src/specify_cli/workflows/steps/prompt/__init__.py
index e81ca175d..ed92e1eea 100644
--- a/src/specify_cli/workflows/steps/prompt/__init__.py
+++ b/src/specify_cli/workflows/steps/prompt/__init__.py
@@ -138,7 +138,10 @@ class PromptStep(StepBase):
         context: StepContext,
     ) -> dict[str, Any] | None:
         """Dispatch *prompt* directly through the integration CLI."""
-        if not integration_key or not prompt:
+        if not integration_key or not isinstance(integration_key, str) or not prompt:
+            # A non-string integration would raise TypeError: unhashable type
+            # from get_integration's dict lookup and abort the run; treat it as
+            # not dispatchable so execute() falls through to its FAILED result.
             return None
 
         try:
diff --git a/tests/test_workflows.py b/tests/test_workflows.py
index 6ea7e9c31..c51df1934 100644
--- a/tests/test_workflows.py
+++ b/tests/test_workflows.py
@@ -1162,6 +1162,21 @@ class TestCommandStep:
             result = step.execute(config, ctx)
         assert result.output["integration"] == "gemini"
 
+    def test_execute_non_string_integration_fails_cleanly(self):
+        """A non-string integration (e.g. a list from an expression that resolved
+        to one) must FAIL the step cleanly, not crash the run with
+        'TypeError: unhashable type: list' from get_integration's dict lookup."""
+        from specify_cli.workflows.steps.command import CommandStep
+        from specify_cli.workflows.base import StepContext, StepStatus
+
+        step = CommandStep()
+        config = {
+            "id": "s", "command": "speckit.plan",
+            "integration": ["claude"], "input": {},
+        }
+        result = step.execute(config, StepContext())
+        assert result.status == StepStatus.FAILED
+
     def test_step_override_model(self):
         from unittest.mock import patch
         from specify_cli.workflows.steps.command import CommandStep
@@ -1359,6 +1374,20 @@ class TestPromptStep:
         assert result.output["integration"] == "claude"
         assert result.output["dispatched"] is False
 
+    def test_execute_non_string_integration_fails_cleanly(self):
+        """A non-string integration must FAIL the step cleanly, not crash with
+        'TypeError: unhashable type: list' from get_integration's dict lookup."""
+        from specify_cli.workflows.steps.prompt import PromptStep
+        from specify_cli.workflows.base import StepContext, StepStatus
+
+        step = PromptStep()
+        config = {
+            "id": "p", "type": "prompt", "prompt": "do it",
+            "integration": ["claude"],
+        }
+        result = step.execute(config, StepContext())
+        assert result.status == StepStatus.FAILED
+
     def test_execute_with_step_integration(self):
         from unittest.mock import patch
         from specify_cli.workflows.steps.prompt import PromptStep